Gear shifting mechanism



March 9, 1937. E. s. KESLING I GEAR SHIFTING MECHANISM Filed May 22, 1955 s Sheets-Sheet 1 Ill-f March 9, 1937. E. KESLING 207321138 GEAR SHIFTING MECHANISM Filed May 22, 19:5 5 sneets sheet 2 Margh 9, 1937.

E. G. KESLING GEAR SHIFTING MECHANISM Fiied May 22, 1935 5 Sheets-Sheet 3 mm \m a: 17%

Patented Mar. 9, 1937 UNITED srA ras PATENT OFFICE 19 Claims.

This invention relates to gear shifting mechanism, and has special utility as a part of the transmission gearing of automobiles and other vehicles. The gear shifting mechanism used is of the type in which fluid energy is utilized to effect both the selecting and the shifting movements.

In the showing of the drawings, vacuum energy is to be used; but it is understood that only minor changes would be required for the utilization of fluid energy under pressure.

The invention does not include any valve controlling means for the power device, as any known valve controlling means may be used; but the invention has to do with the association of the power device with the gear shifting mechanism; and also includes an emergency manual control for the shifting mechanism to be used to select and shift the gears in case the power device fails go to do so, or in case no fluid energy is being supplied.

Heretofore, power shifting mechanisms have been constructed with provision for inserting an emergency lever in a manner to efiect the selecting and shifting in case the power device should fail to do so. This emergency lever was carried as an extra part, probably in the tool box, and there was always a possibility of getting it misplaced or lost.

An object of the invention is to provide an emergency control that is always in place and ready for the operators use in case it is needed.

Another object of the invention is to provide an emergency control of such construction that it is not moved from the neutral position by the shifting operations of the power device.

Another object of the invention is to provide a construction wherein the emergency control will be in easy reach of the operator and out ofthe way of all occupants of the automobile.

A further object is to provide a construction in which all parts are enclosed and either operate in oil or easily supplied with the required oper- 45 ating oil.

Various other objects and advantages of the invention will be made apparent from the following description, reference being made to the annexed drawings, in which:

Fig. 1 is a vertical sectional view approximately on the line I-l of Fig. 2 showing the connections of the operating mechanism with the devices directly operated thereby.

Fig. 2 is a sectional view approximately on the I 55 line 2-2 of Fig. 1.

Fig. 3 is a vertical sectional view approximately on the line 3-3 of Fig. 2.

Fig. 4 is a sectional view approximately on the line 4-4 of Fig. 2.

Fig. 5 is a sectional view approximately on the 5 line 5-5 of Fig. 1.

Fig. 6 is a vertical sectional view of the upper end-of the emergency control and its supporting means.

Fig. 7 is a sectional view line 1-1 of Fig. 6.

Fig. 8 is a sectional view approximately on the line 88 of Fig. 7.

Fig. 9 is a sectional view approximately on the line 9-9 of Fig. 7.

Fig. 10. is an enlarged sectional view approximately on the line Iiiof Fig. 7.

An elongated hub l is mounted for rotation in a bearing 2 in a casing 3 and has an integral gear 4 which meshes with a rack 5 integral with a low and reverse shifting yoke B.

A shaft 1 is mounted for rotation in the huh I and has an integral gear 8 which meshes with a rack 9 integral with a high and intermediate shifting yoke i0. 25

A segmented gear It is secured upon the hub l near the end of the hub, and a segmented gear I2 is secured on the adjacent projecting end of the shaft 7.

The adjacent hubs of the gears H and I2 have cutaway portions forming surfaces l3 and I4 and have end walls I5 and I6, respectively. The surfaces l3 and it are curved on an equal radius from a common axis, and are relieved as at I! for purposes hereafter noted. 5

I A shaft 18 is mounted for rocking and longitudinal movements in a casing l9 which is secured to the casing 2.

Secured to the shaft 18 is an actuator 20 which is moved with the shaft IS. The actuator 20 has rack teeth 2| and 22*which selectively mesh with the gears H and I2, respectively. The actuator 20 also has a projecting rib 23, which has a curvel surface 24 and flat side walls 25 and 26.

The shaft l8 projects beyond the casing l9 and is rotatively secured in a piston 21 as shown or in any known manner. The pistol 21 moves with the longitudinal movements of the shaft IS in a vacuum cylinder 28 secured to the adjacent end of the casing 9. The other end of the casing l9 has a tubular projection 29 form-.- ing the bearing for that end of the shaft !8.

It is here noted that in reality the shaft l8 and the actuator 20 may together he termed the actuator l8-20; because they are positively atapproximately on the 10 tached and always move together. -It is also to be noted that the shaft l8 becomes the piston rod for the power shifting device, and one end element of the emergency control.

The actuator 20 also has gear teeth 3G cut longitudinally thereupon in such a manner as to form a special gear for meshing with gear teeth 3| out upon a shaft 32 which is mountedfor longitudinal movements in the casing #9. One end of the shaft 32 is mounted in a bearing 33 in a wall of the casing i9, and the other end is mounted in an adjustable bearing means 3% screwed into the opposite wall of the casing is, and secured with a nut 35 and cotter pin 36. The end of the shaft 32 having hearing in the bearing member 34 is reduced in size forming a shoulder 3'5 for butting against the end 38 of the member 3d.

A slit 39 is provided in the member 34 for the purpose of relieving trapped grease that might get into the hearing member 34.

The other end of the shaft 32 projects beyond the casing as into a vacuum diaphragm casing 46 whichis secured to the adjacent side of the easing 99 by bolts ll.

A flexible diaphragm S2 is circumferentially secured in the casing fill with bolts 63, and in a groove 46 in the projecting end oi the shaft 32 by use of a two part metal disk 55, side disks and rivets ll. The diaphragm 42 separates the casing ell into chambers 48 and 49.

A spring 558 normally holds the diaphragm 32 and shaft 32 in the longitudinal position shownin the drawings. In the showing of the drawings,

a spring 58 is mounted on the shaft 32 within the jacent end of the shaft 32, and is secured by a nut 52 and cotter pin The member 34 and the member 5i are adjustable to regulate the longitudinal travel of the shaft 32.

A vacuum connecting tube 58 is secured in the wall of the chamber 53, and a hole 55 is provided through the wall of the chamber #9.

The piston 21 forms the cylinder 28 into separate chambers 56 and 5?. Vacuum connecting tubes 58 and 58 are secured in the walls of the chambers 56 and 51', respectively.

The end of the shaft l8 supported in the projection 29 has a reverse and intermediate speed groove 60, a neutral groove 6i and a low and high speed groove 62, respectively, out circumferentially in spaced relation.

A hole 63 is provided in the adjacent wall of the casing IQ for the reception of a spring pressed ball 64 for engagement with either of the grooves 60, 6|, or 62. The grooves 60, El and 62 are so placed that, when the ball 64 is in the groove 6|, the actuator 18-20 will be longitudinally located for selective positioning; and, when the ball Si is in the grooves 60 or 62, the actuator l8-2G will have been completely moved to .a shifted position.

One end of a curved guide tube 65 is secured in the end of the projection 28 and the other end is adjustably secured in one end of the member 6% by bolts 61 and 68. The member 66 is secured to the instrument panel 69.

A flexible shaft EU is mountedfor rocking and longitudinal movements in the curved guide tube 65, and has one end secured to the adjacent end of the shaft l8 and the other end to one end of a shaft H which is mounted for certain rocking and longitudinal movements in the tubular shaft 12.

The tubular shaft 12 is mounted for rocking and longitudinal movements in the member 66. The tubular shaft 12 projects beyond the end of the member 56, and an operating handle it is secured to said projecting end by the use of a stub shaft It with rivets l5 and a screw 16.

The tubular shaft '52 has opposite longitudinal grooves ll provided in its inner wall.

A block it is mounted between the respective ends of the shafts ill and "M for sliding movements in the grooves H. A. hole "it is provided in the block it in line with the longitudinal axis of the shaft H. wire Ed is secured by soldering or otherwise in the hole 39, and the other end extends into an axial hole iii in the adjacent end of the shaft H and is secured by soldering or otherwise in the hole ti.

In the showing of the drawings, the block 78 has a groove 82 in one edge across the hole is and a second hole provided in the block it connects with the groove 32 and is near to and parallel with the hole l9. One end of the wire 88 is bent in such a manner that the bent end is received by the hole 83 and groove 82 when the wire has been placed in the hole it. The wire 88 thus placed may be securely attached to the block it with solder.

In the showing of the drawing, the hole St has an outer enlarged portion and an inner smaller portion which connects with a hole 84 drilled through the shaft 7 t; and a pin 85 having a iongitudinal groove $6 in one side fits snugly in the hole 85-. The other end of the wire 30 has been inserted into the hole 85 and projected into the hole 85 and the pin 85 has then been driven into the hole 86 in such a manner to bend the end of the wire 8d so the bent end will repose in the groove 86 as shown in the drawing. The wire 8!? thus placed may be securely attached to the shaft '85 with solder.

A notch ii? is provided in the wall of the tubular shaft l2.

A spring pressed ball 88 is mounted in a hole 29 in a projection 9i! on themember 56 for engagement with the notch 81.

A. longitudinal slit SM is provided in one side of the tubular shaft l2 parallel with the groove H.

A slot 92 is provided through the wall of the member 66.

A tapered hole 93 is provided through the shaft TI into which is inserted a tapered pin 94 which also projects through the slit 9| and the slot 92.

The parts are so constructed and arranged that the block 18 in cooperation with the grooves Ti and the actionof the spring wire 80 will normally hold the shaft H in such rotative relation that the projecting end of the pin 94 will repose for free movement along the slit 9|. The slit 9! and the slot 92 are both long enough to allow the shaft H to have the same longitudinal movements as the shaft l8.

Recesses 95 and 96 for engagement with the pin 94 are provided in the wall of the tubular shaft 12 in communication with opposite sides, respectively, of the slit 9 I. The parts are so con- One end of a length of spring structed and positioned that, when the ball 64 is in the groove 6| and the ball'8 is in the notch 81, the recesses 95 and 96 will be in line for engagement with the pin 94. The recesses 95 or 96 are made to engage the pin 94 by the respective rotation of the tubular shaft 12 and the block 18 against'the action of the spring 89.

The parts 10, H, 12, "etc. form the emergency control by which the operator may select and shift thegears in case the power device fails to do so, or when no fluid energy is being supplied.

ing means for the emergency control.

The rotative movements of the actuator 20, shaft i8, shaft 10 etc. are selective movements, and longitudinal movements of these parts are shifting movements.

It is obvious that'the rotative movements of the actuator 20 and shaft iii are limited by the engagement of the racks l l and I2 with the gears 2| and 22, respectively, or by the engagement of the surfaces l5 and I6 with the surfaces 25 and 26, respectively.

On accoimt of the elasticity of the flexible shaft 10 under rotative forces, a certain amount of twist is given to it when sufficient manual force has been applied to the emergency operating handle 13 to insure complete selective movement of the actuator 20; and, since the rotation of the parts operated by the flexible shaft 19 is limited, the slot 92 in the member 66 is provided for engagement of the pin 94 for the purpose of limiting the rotation of the operating end of the flexible shaft 10 in order to prevent undue twisting of the said shaft 10 by the operator during emergency selective movements. Otherwise, the operator might unthinkingly twist the flexible shaft 10 to the point of injury.

The notch 81 may be made any required depth and length to afford sufficient engagement with the ball 88, however, in the. showing of the drawing, the notch 91 varies in depth being deeper in the central portion and gradually shallower toward the ends. The depth and length are such that the ball 99 cannot be disengaged from it until the shaft 12 has been turned a sufficient distance to engage the pin 94 against a side wall of the slot 92. I

The recesses 95 and 99 need, of course, to be in position opposite the pin 96 in order that the pin may be engaged by either of them. If it so happens that the recesses 95 and 96 are out of this position and the notch 81', is in engagement with the ball 88, the shaft 12 will first need to be rotated at distance sufficient todisengage the notch 91 from the ball 88 and then moved longitudinally until the recesses are in position to engage the pin after which the shaft 12 may be rotatedan additional distance against the action of the-spring wire 89 to engage a recess 95 or 96 with the pin'9 i. Of course, it is obvious that the resilient action of the wire 89 will re turn the shaft 12 to normal rotative relation relative to the shaft ll as soon as this manual force is released.

Selective movements are effected only when the ball 84 is in the groove 6!.

In selection by power, resilient. means is used to effect selection for shifting into intermediate and high speeds; and fluid energy is used acting against the action of the resilient means to effect selection for shifting into reverse and low speeds.

, In the operation of the device, the following conditions will be noted: That the shaft l8 and the actuator 29 cannot be rocked except when in such longitudinal position that the surfaces l3 and I4 coincide, which condition allows the 24 is entirely free of one or the other of the sur- The parts 12 and 13 form the manual operat prevented by the engagement of the surface I5 with the surface 25 or the engagement of the surface IS with the surface 26, as the case may be; that when the surface I6 is notengaged with the surface 26, the action of the spring 50 autornatically keeps I8-20 turned so the teeth of the gear l2 are entirely engaged by the rack teeth 22; that the gear II or l2 not in mesh with the rack teeth 2| or 22, respectively, will be held against turning by the surface 24 engaging the surface l3 or l4 as the case may be; that a selected position is the full rotation allowedthe actuator 20 in either direction; that the shaft 10, shaft 1|, pin 94, spring and block 18 being attached together and the shaft 10 secured to the shaft l8, the said parts 10, 1| 94, 80 and 18 will be both rotated and moved longitudinally with the shaft l8; that rotation of said parts I8, 10, 1|, 94, 80 and 18 will also rotate the shaft 12 and the handle 13 positively by the pin 94 engaging the slit 9|, or'resiliently through the spring 80 and by the block 18 engaging the slots 11 when the pin 94 is opposite the recesses Hand 96; that longitudinal movement ofsaid parts l8, 10, 1|, 94,80 and it will not normally move 12-13 longitudinally, because of the free movement of the pin 94 in the slit 9!, that 12-19 is normally held against longitudinal movements by the notch 81 engaging the ball 98; that power selective movement never rotates 12-19 sufficiently to disengage the notch 91 from the ball ea; that 12-13 may be manually rotated to-disengage the notch 81 from .the ball 88 and moved longitudinally when so disengaged; that the manual rotation of 12-13 to disengage 91-89 may be against the, resilient action of the flexible shaft 10; that when 81-88 has been disengaged and 12-13 moved longitudinally, longitudinal movements of said parts I 8,

19, 1f, '94, 99 and 18 in the opposite direction will move 52-13 to the position for engagement of the notch 81 with the ball 88, because the pin 94 gagement from'the ball 88 will be effected when the pin 94 has been moved to substantial contact with a side wall: of the slotl92; that 12-13 may be manually rotated to engage the recess or 96 with the'pin 94 when in proper longitudinal relation for such engagement; that when either of the recesses 95 or 96 is in engagement with the pin 94, manual longitudinal movements of 12-13 will also move H, 19, I8, etc. longitudinally in the same direction; that the manual force rotating 12-13 to engage either of the recesses 95 or 96 is against the action of the spring 89; that as soon as the manual rotating force is relieved, 12-13 will be returned to normal rotative relation relative to H by the action of the spring 80 through the block 18 engaging the slots 11; and various other conditions will be noted throughout the specification.

5 Therefore, in making a shift into low or reverse speed by power means, starting from the position shown in Figs. 2 and 3, vacuum is created in chamber 48 through tube 54 from a source of vacuum energy, not shown, whereupon atmospheric air will rush through the hole 55 into chamber 49 and push the diaphragm 42 and shaft 32 against the action of the spring 50 in the longitudinal direction to cause the teeth III-30 to turn the actuator 20 to the fully selected position where the rack 2I will be entirely in mesh with the gear II and the surface 24 will be entirely free from the surface I3; and then vacuum is created in chamber 56 or 51 through tube 58 or 59, respectively, from a vacuum source, not

shown, whereupon atmospheric air will rush into chamber 51 or 56 through tube 59 or 58, respectively, and push the piston 21, rod I8 and actuator 20 longitudinally to shift the selected gear as desired through the parts II, I, 4, 5 and 6. Then,

25 to shift into intermediate or high speed by power means, the parts are brought to neutral position by creating vacuum in the correct chamber 56 or 51 and the action on the piston and other parts are simply reversed from that of shifting movements. As soon as selection position of the actuator 20 etc. is reached and the surface 25 or 26 has been freed from the surface I5 or IE, respectively, as the case may be, the spring 50 will automatically move the shaft 32 etc. longitu- 35 dinally in the direction to cause the teeth 3I-30 to turn the actuator 20 to the fully selected position where the rack 22 will be entirely in mesh with the gear I2 and the surface 24 will be entirely free from the surface I4; and then vacuum is created in chamber 56'or 51 through tube as or 59, respectively, from a vacuum source, not shown, whereupon atmospheric air will rush into chamber 51 or 56 through tube 59 or 5., respectively, and push the piston 21, rod I8 and actuator .24 longitudinally to shift the selected gear as desired through the parts I2, 1, 4, 9 and III.

As noted heretofore, the entire emergency control turned with the actuator 24 during the above selective movements; and. as also noted heretofore, the parts", 14,", as, so and is moved longitudinally with the actuator 24 while the parts 12-14 were not moved with the actuator 24 during the above shifting movements.

Manual turning force applied to the handle 13 will always be against the pin 94 from a side of the slit 9|, except at the time the pin 44 is opposite the recesses 55 and 44 when such force will be against the torsional action of the spring wire II. ,It will be understood, however, that 50 should the handle 14 be turned until the end of the recess engaged encounters the pin 94, said pin will receive all of the manual force applied-in excessof the torsional strength of the spring wire 80. It is obvious that the twist of the wire .0 will never be more than the depth of the recesses 95or58,asthecasemaybe.

In the manual operation of the emergency control, the manual operating means 13-12 is turned, preferably in the direction of the selection desired, to effect disengagement of the notch 81 from the ball 88, if so engaged, and then rotated an additional distance to engage a recess 95 or as, as the case may be, with the pin 94, if in position for such engagement, whereupon,

if these movements have been inthe direction of.

selection for shifting into intermediate or high speed, the spring 50 has already effected the fully selected position of the actuator 20 where the turned the actuator 20 against the action of the spring 50 to the fully selected position where the rack teeth 2| would have been entirely in mesh with the gear II and the surface 24 would have been entirely free from the surface I3, and manual force may have been applied to move the emergency control together with the actuator I8--20 longitudinally to have shifted the selected gear as desired through the parts I I, I, 4, 5 and 6.

It is understood, however, that if in manual selecting, the pin 94 is not in position for engagement with the recess 95 or 96, the manual operating means 1312 after having been disengaged from the ball 88 is moved longitudinally until the recesses 95 and 96 are in position for engagement with the pin 94, and then the manual operating means 13-12 is turned to engage the desired recess 95 or 96 with the pin 94; whereupon man- -ual force may be applied to move the entire emergency control together with the actuator Ill-20 longitudinally as desired to shift the selected gear as aforesaid, or to effect selection position whereat manual force may be applied to effect the selection desired as aforesaid, and then the selected shift manually completed as aforesaid;

It is obvious that an emergency control of the type shown and described in this application is applicable to any power shifting mechanism having a single actuator that is mounted for rotative selective movements and longitudinal shifting movements.

I do not restrict myself in any unessential respects but what I claim and desire to secure by Letters Patent is:

1. In a gear shifting mechanism normally controlled by power means, an emergency control for said gearshifting mechanism operatively connected with said mechanism, a support, a manual operating means for said emergency control mounted on said support. and a pin and silt means for connecting said operating means in operative relation with said emergency control to manually operate said emergency control and thereby said gear shifting mechanism.

2. In a selective gear shifting mechanism normally controlled by power means, anemergency control for said gear shifting mechanism operatively connected to said mechanism, a manual operating means for said emergency control, means normally connecting said operating means with said emergency control for manually effecting gear selective movements, and means manually engageable for connecting said operating means with said emergency control for manually effecting gear shifting movements.

3. In a gear shifting mechanism normally controlled by -power means, an emergency control for said gear shifting mechanism comprising a manual operating means, a flexible shaft operatively connected with said gear shifting mechanism, and a pin and slit means for connecting said operating means-in operative relation with said flexible shaft for manually operating said flexible shaft and thereby said gear shifting mechanism.

4. In a selective gear shifting mechanism normally controlled by power means, an emergency control for said gear shifting mechanism comprising a manual operating means, a flexible shaft operatively connected with said gear shifting 10 mechanism, means normally connecting said operating means with said flexible shaft for manually eifecting gear selective movements, and

means manually engageable for connecting said operating means with said flexible shaft for manually effecting gearshifting movements.

5. In a gear shifting mechanism normally con trolled by power means, an emergency control 6. In a gear shifting mechanism normally con-' trolled by power means, an emergency control for said gear shifting mechanism comprising a tubular operating device mounted for rocking and longitudinal movements, an operated device mounted in said tubular device for rocking and longitudinal movements, and means associated with said devices cooperating to lock said devices in normal rotating relation for simultaneous rotation, and at the same time allowing certain free relative longitudinal movements of said devices.

7. In a gear shifting mechanism normally controlled ,by power means, an emergency control for i said gear shifting mechanism comprising a tubular operating device mounted for rocking and longitudinal movements, an operated device mounted in said tubular device for rocking and longitudinal movements, resilient means associated with said devices urging normal rotative relation between said devices, a slit formed in one of said devices, engaging means mounted on the other one of said devices and cooperating with said slit to lock saiddevices in normal rotative relation for simultaneous rotation and at the same time allowing certain free relative longitudinal movements of said devices, and additional means associated with said slit and cooperating with said engaging means by rocking said devices difierentially against the action of said resilient means to engage said devices for simultaneous longitudinal movements.

8. In a gear shifting mechanism normally controlled by power means, an emergency control for said gear shifting mechanism comprising a tubular shaft mounted for rocking and longitudinal movements, a spindle mounted in said tubular shaft for rocking and longitudinal movements, grooves formed in the inner wall of said tubular shaft, means mounted for sliding movements in said grooves, and resilient'means connected to said means and to said spindle, said resilient means urging normal rotative relation between said shaft and said spindle.

9. In a gear shifting mechanism normally controlled by power means, an emergency control for said gear shifting mechanism comprising a tubular shaft mounted for rocking and longitudinal movements, a spindle mounted in said tubular shaft for rocking and longitudinal movements, and a pin and slot connection associated with said shaft and said spindle cooperating to lock said shaft and said spindle in normal rotative relation for simultaneous rotation, and to allow certain free relative longitudinal movements of said shaft and said spindle.

10. In a gear shifting mechanism normally controlled by power means, an emergency control 'forsaid gear shifting mechanism comprising a tubular operating device mounted for rocking and. longitudinal movements, an operated device mountedin said tubular device for rocking and longitudinal movements, a longitudinal slit in the wall of said tubular device, means connected to said operated device and projecting through said slit to lock said devices in normal rotative relation for simultaneous rotation, said projection being movable along said slit allowing free relative longitudinal movements of said devices, and recesses in the wall of said tubular device communicating with said slit for engagement of said projection upon differential rotation of said devices forsimultaneous longitudinal movements of said devices.

11. Mechanism of the character described comprising selective gear'shifter elements, an actuator engageable to shift said elements, power means connected to said actuator for normally selectively engaging said actuator, a second power means connected to said actuator for movr ing said actuator to shift the selected element, a

manual emergency operating means supported at a remote point, a flexible shaft having one end connected to said actuator, and a pinand slit means associated with the other end of said flexible shaft and said operating means opera tively to engage said operating means with said flexible shaft and thereby said actuator for manually effecting selective shifting of said shifter elements in case said power means fails to shift the same.

12. A gear shifting mechanism normally operated by power means, an emergency operating means for said gear shifting mechanism comprising a tubular shaft mounted for rocking and longitudinal movements, a spindle mounted in said tubular shaft, a pin and slit connection preventing relative rotation between said shaft and said spindle, and a recess in the side of said operating means, and a pin and slit means for engaging said manual operating means with said emergency control at will for manually operating said actuator in emergency.

14. Gear shifting mechanism of the character described comprising a case, a shifter actuator supported in said case, power means connected I to said actuator for normally operating said actuator, a bearing member supported at a distance from said case, a curved tube connecting 1 said case and said member, a tubular shaft mounted for movement in said member, a spindle mounted for movement in said tubular shaft, means associated with said tubular shaft and said spindle for operative engagement therebetween, a flexible shaftmounted in said curved tube operatively connecting said actuator with said spindle, and manual means attached to said 16. An emergency control for gear shiftingmechanism comprising a manual operating portion, an operated portion, means for'iree normal loss motion connection between said operating portion and said operated portion, and engaging means associated with said operating portion and said operated portion for positive operative engagement therebetween.

17. Mechanism of the character described comprising a selective shifter actuator, a gear segment formed on said actuator, a rack mounted for longitudinal movements and meshing with said gear segment, a power device connected to said rack for moving said racl: to selectively position said actuator, and a second power device connected to said actuator for moving said actuator after being selectively positioned. I

18. Mechanism of the character described comprising a selective shifter actuator, a power device connected to said actuator for positioning said actuator selectively, a second power device connected to said actuator for imparting shifting movements to the selected actuator, an

emergency control connected to said actuator and moved by said actuator during both selecting and shifting movements by said power devices respectively, an operating means for said emergency control, and a pin and slit connection for connecting said control and said operating means, whereby said operating means is moved by said control during said power selecting movements, and unmoved by said control during said power shifting movements.

19. Mechanism of the character described comprising a selective shifter actuator, a power device connected to said actuator for positioning said actuator selectively, a second power device connected to said actuator for imparting shifting movements to the selected actuator, an emergency control connected to said actuator and moved by said actuator during both selecting and shifting movements by said power devices respectively, a support, an operating means for said emergency control mounted for movement in said support, a pin and silt connection for connecting said control and said operating means for effecting movement of said operating means by said control during said power selecting movements only, and means associated with said operating means and said support normally holding said operating means from movement during said power shifting movements.

ELMER G. KESLING. 

